在平行六面体
中,
,
,点
为
与
的交点,点
在线段
上,且
.
![](https://img.xkw.com/dksih/QBM/2021/8/26/2794418139414528/2795253909938176/STEM/6abbc57c-a0c7-4c1f-963d-de0bcc89d86c.png?resizew=269)
(1)求
的长;
(2)设
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926720901aaadb0f4556caec51d3eeab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b735c72cfb59b24ec9c4aae288942252.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0f0ccc8492a0ccf1eee24867060643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/020ebe1219437129358b986eb9e70bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c92b5799d12ea37de46d7c942ce7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a9e0317741e5248efae26481ff7072.png)
![](https://img.xkw.com/dksih/QBM/2021/8/26/2794418139414528/2795253909938176/STEM/6abbc57c-a0c7-4c1f-963d-de0bcc89d86c.png?resizew=269)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c92b5799d12ea37de46d7c942ce7a9.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e3e28aacf0884a6317fceca7837cb32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a14c388e1e2e5a2ff1ccf6caffbee0d.png)
更新时间:2021-08-27 16:21:32
|
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(0.85)
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【推荐2】如图所示,平行六面体
中,
,
,
,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d927585a17c2e98ef7d5a9589a26ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a674aa2ce5caabcad5abe65b5402ce6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/d4226b28-bb9e-4334-bb33-88f8523ea13c.png?resizew=216)
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解答题-问答题
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较易
(0.85)
【推荐1】棱长为1的正四面体ABCD中,点E,F,G分别为AB,AD,DC中点,求:
(1)
;
(2)
;
(3)
;
(4)
;
(5)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/333499181deb97cb793630a3d484f178.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/471afefb76c00f9b315aa5b34133011c.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f5c865b5b1d57cec622591619d5214.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dbf0223862d5738a29919b841430642.png)
(5)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c12504a56ea972447663ee08568b6909.png)
您最近一年使用:0次
解答题-问答题
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较易
(0.85)
名校
【推荐2】如图,在平行六面体
中,
,
,
,
,
,E是
的中点,设
,
,
.
![](https://img.xkw.com/dksih/QBM/2024/2/27/3442137987874816/3442815395504128/STEM/0cf01575e77441be876f6718494246c6.png?resizew=229)
(1)求
的长;
(2)求异面直线
和
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55a2310cbba5e050488cd9296eb195d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2b377f22aafd3742ad860f77abaacef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a674aa2ce5caabcad5abe65b5402ce6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7b9d8a08fc52c31cc1a7f527d18b55c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/184359fe3cadc363cf4ebe586c2b3db4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2410e0e103cc41264a2d0f5c0e3f3ed4.png)
![](https://img.xkw.com/dksih/QBM/2024/2/27/3442137987874816/3442815395504128/STEM/0cf01575e77441be876f6718494246c6.png?resizew=229)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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